My boss once did a similar thing with the quality department. Suddenly we sailed through our DFMEAs. Some people do live to block others, but some are trying to do an important job. Engagement usually pays more than just whinging.
It sounds like they were focused on building product too, then, which is not at all what this is about.
The day to day was reading the comms for a bunch of projects, finding places where you could be valuable, then reaching out to a bunch of project owners and convincing them to talk to you about the project.
I had them reach out once because I was working on a project that dealt with data for school children. We were exploring to see if we could use data help teachers intervene early and prevent bullying. They reached out to make sure we understood the legal implications of dealing with data for minors, and that we weren't just building a product that would encourage the administration to pigeonhole students.
After a brief conversation we got signoff and some great feedback on how to support positive outcomes while avoiding the risk of creating something that felt Orwellian
They consistently thought about the nuances of baking privacy into a product in a way that I didn't have the background or time for. Every time I worked with them, they helped me build a better product by helping me tweak the specs in a way that had minimal impact on our users (unless they were a bad actor) and strongly increased privacy protections. It was like having a specialized PM in the room